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Unanswered: Searching for empty fields

I am having troubles with that simple issue. On my form I have 3 combo boxes and I am filtering the records according to the selections of each combo box. It works fine.

However, I have also two check boxes. If CheckBox1 is set to Yes, I want to further filter the records by selecting only customers who have e-mail addresses. I am trying to accomplish this by simply adding another condition to the sql string for the RecordSource. This works fine too.

My CheckBox2 (if set to Yes) should filter only customers with NO e-mail addresses. And this is the problem.